30 MR THOMAS STEVENSON ON THE FORCE OF THE 
height of spray, &c. were generally kept; but it was not considered necessary to 
complicate the Tables by inserting these, excepting in one or two instances. 












lbs. to a Ibs. to a lbs. to a Ibs. to a 
Pees: Square Foot aie Square Foot. Mia Square Foot. et Square Foot. 
Observations at Little Ross. 1844. 1844, 
1842, 1842. Feb. 3 April 19 
April 25 15 June 25 458.0 ES ore Sees 
Sl lee 51 July 25 | 380.0 we 18 vee ee 
June 1 36 Aug. 2 | 570.0 GD Oe ve 22 
4 81.5 eh |, OBRM ay le sea lald 
20 86.5 wee 6 380.0 BS" macs 296. gales 
24 | 840.0 a) 79) S80 are ones 
The Observations at the Skerryvore Rock, and oh es 
the neighbouring Island of Tyree, distant 13 miles Sine 
from the Skerryvore, are as follows :— er 
1843. 1843. 
April 24 455 Aug. 9 346 ae oS. 
con | 707 See ee) 723 ve 026 
May 7 243 Eee me Om 389 oY ae 
Sco wei! 182 Sept. 5 866 
12 243, nae wy ae 952 
16 364 Octwao 1535 
20 { 495 Bok: 6 1606 
476 Nov. 18 1711 
June 3 182 boule gfe) 1497 
4 519 soe P06 1497 
7 428 oan 4s) 2353 
8 855 Dec. 5 2674 
Sec 9 173 8 (Ath 
July 2 476 ib At least 
3 ie sa AE 2460 
866 ear 26 1947 
soa ele 433 
In January, two instruments were placed beside 

each other, but not set parallel. These instruments 
had springs of different power, the one being about 
double that of the other, and one had a dise of 3 
inches diameter, the other 6 inches. 
1844. 1844. 
Jan. 6 962 Jan. 9 1925 
Ste aoe 928 soc aoe 1000 
ui 2353 5 fly 826 
857 isis ok 1000 
Both instruments set parallel. 
1844. 1844. 
Jan. 16 428 Jan. 16 427 





Another instrument was placed beside them, but 
the two marked thus * were found to be too weak, as 
the leathers were found flattened, and one of the 
instruments was broken, and was not repaired till 
the 15th February. 

1844. 1844, 
Jan. 28 3422* Feb. 2 429 
é aa 2285* Bee! Vice 457 
aoe 3313 
1 On this occasion, 14 stones were slightly moved, and 14 scattered, all of which had been built into the 
round-head or end of Hynish Pier, which was still in an unfinished state, and a Dynamometer which was 
attacked to the Pier, registered on this occasion 2557 lb. These stones weighed from 1 to 1} tons, and ex- 
posed, when built into the wall, about 2 square feet of surface. The stone to which the instrument was fixed 
was turned upside down, although it weighed about 13 ton = 2800 lb. 
